Homeopathic treatment for abscess
If we need antibiotic medicines which will drain the pus too; Homeopathy is the best choice, they work best as an antibiotic/antiviral and expel the pus from deep and cleans the wound, shortening the cure time. Homeopathic medicines target the root cause/triggers factors of the disease. Here are few of Homeopathic medicines for abscess: 
Mercurius Solubilis
Syphilitic pustules. Skin almost constantly moist. Excessive odorous viscid perspiration. Vesicular and pustular eruptions. Ulcers, irregular in shape, edges undefined. Pimples around the main eruption. Itching, worse from warmth of bed. Crusta lactea; yellowish-brown crusts, considerable suppuration. Glands swell every time patient takes cold. Buboes.
Generally gastric or bilious fever, with profuse yellow perspiration, nightly perspiration; debility, slow and lingering. Heat and shuddering alternately.
Graphite
Skin rough, hard, persistent dryness of portions of skin unaffected by eczema. Early stage of keloid and fibroma. Pimples and acne. Eruptions, oozing out a sticky exudation. Rawness in bends of limbs, groins, neck, behind ears. Unhealthy skin – every little injury suppurates. Ulcers discharging a glutinous fluid, thin and sticky. Swelling and induration of glands. Gouty nods. Cracks in nipples, mouth, between toes, anus. Phlegmonous erysipelas of face; burning and stinging pain. Swelling of feet. Wens. Feels as if cobwebs were on it. Eczema. Moist eczema. Erysipelas, burning and stinging. Scabs and fissures in nostrils. Itching pimples.
Pulsatilla Pratensis
Urticaria, after rich food, with diarrhea, from delayed menses, worse undressing. Measles. Acne at puberty. Varicose veins. Thick, profuse, yellow, bland discharges from eyes. Itching and burning in eyes. Profuse lachrymation and secretion of mucus. Lids inflamed, agglutinated. Stys. Veins of fundus oculi greatly enlarged. Ophthalmia neonatorum. Subacute conjunctivitis
Clematis Erecta
Skin red, burning, vesicular, scaly, scabby. Itches terribly; worse, washing in cold water; worse face and hands and scalp around occiput. Glands hot, painful, swollen; worse inguinal glands. Glandular indurations and tumors of breast. Varicose ulcers. White blisters on face and nose. Swelling of submaxillary glands, with hard tubercles, throbbing, aggravated on being touched. Eruption on occiput at base of hair, moist, pustular sensitive, itching.
Belladonna
Skin dry and hot; swollen, sensitive; burns scarlet, smooth. Eruption like scarlatina, suddenly spreading. Erythema; pustules on face. Glands swollen, tender, red. Boils. Acne rosacea. Suppurative wounds. Alternate redness and paleness of the skin. Indurations after inflammations. Erysipelas.
High feverish state with comparative absence of toxemia. Swelling of glands of neck. Parotid gland swollen. Face red, bluish-red, hot, swollen, shining; convulsive motion of muscles of face. Swelling of lips. Facial neuralgia with twitching muscles and flushed face. Sensitive to loud tones. Hearing very acute. Otitis media.
Arnica Montana
Skin black and blue. Itching, burning, eruption of small pimples. Crops of small boils. Ecchymosis. Bed sores. Acne indurates, characterized by symmetry in distribution. Soreness of gums. Septic conditions; prophylactic of pus infection. 
Icthyolum
Its action on skin, mucous membranes, and kidneys is prompt and useful. It is strongly anti-parasitic, best pain killer and anti-inflammatory. Treats tension. Heat and irritation; itching. Scaly and itching eczema. Crops of boils. Pruritus of pregnancy. Psoriasis, Acne, rosacea, erysipelas. Skin feels dry and itches. Acne.
Calceria Sulphuricum
Cuts, wounds, bruises, etc., unhealthy, discharging pus; they do not heal readily. Yellow, purulent crusts or discharge. Purulent exudates in or upon the skin. Skin affections with yellowish scabs. Many little matterless pimples under the hair, bleeding when scratched. Dry eczema in children.
Hepar Sulphuricum
Yellowish complexion, unhealthy skin. Vesicular erysipelas, with pricking. Ulcers in corners of mouth. Papules prone to suppurate and extend. Acne in youth. Suppurate with prickly pain. Easily bleed. Angioneurotic edema. Chapped skin, with deep cracks on hands and feet. Ulcers, with bloody suppuration. Putrid ulcers, surrounded by little pimples. Great sensitiveness to slightest touch. Chronic and reoccurring urticaria. Smallpox. Herpes Cincinnatus. Constant offensive exhalation from the body.
Antimonium Crudum
If acne is of granular like eruption, lumpy, red, burning, suppurating postural like eruptions on the face with red areola have an inflamed (red, and sensitive/painful) base.
Blotches type acne over cheek with heat sensation; Postural type acne: The emotional picture of the person could be depressed (the deep-seated triggers factor), exhausted for life.
Sulphur
Herpes across the nose. Dry, scaly, unhealthy; every little injury suppurates. Freckles. Itching, burning; worse scratching and washing. Pimply eruption, pustules, rhagades, hangnails. Excoriation, especially in folds. Feeling of a band around bones. Skin affections after local medication. Pruritus, especially from warmth, is evening, often recurs in springtime, in damp weather.
Silica Tera
Pale and earthy complexion. White spots on cheeks, from time to time. Red, burning spots on cheeks and nose. Itching in whiskers. Furunculus on cheek. Cracks and rhagades. Scabious eruption on lips. Felons, abscesses, boils, old fistulous ulcers. Delicate, pale, waxy. Cracks at end of fingers. Painless swelling of glands. Rose-colored blotches. Scars. Side effects of vaccination: Bursa. Lepra, nodes, and coppery spots. Keloid growths. 
Berberis Aquifolium
A medicine of the choice for the skin. Acne. Blotches and pimples. Clears the complexion. Pimply, dry, rough, scaly. Eruption on scalp extending to face and neck. Tumor of breast, with pain. Psoriasis. Acne. Dry eczema. Pruritus. Glandular induration.
Dulcamara
Humid eruption on cheeks and face generally. Adenitis. Pruritus, always worse in cold, wet weather. Herpes zoster, pemphigus. Swelling and indurated glands from cold. Vesicular eruptions. Sensitive bleeding ulcers on skin. Little boils. Red spots, urticaria, brought on by exposure, or sour stomach. Humid eruptions on face, genitals, hands, etc. Warts, large, smooth, on face and palmar surface of hands. Anasarca. Thick brown-yellow crusts, bleeding when scratched.
Bovista
Scurf and crusts about nostrils and corners of mouth. Lips chapped. Bleeding of nose and gums. Cheeks and lips feel swollen. Acne worse in summer; due to use of cosmetics. Blunt instruments leave deep impression on the skin. Urticaria on excitement, with rheumatic lameness, palpitation and diarrhea. Itching on getting warm. Eczema, moist; formation of thick crusts. Pimples cover the entire body; scurvy; herpetic eruptions. Pruritus ani. Urticaria on waking in the morning, worse from bathing. Pellagra.
Lycopodium
Grayish-yellow color of face, with blue circles around eyes. Withered, shriveled, and emaciated; copper-colored eruption. Itching; scaly herpes in face and corner of mouth. Ulcerates. Abscesses beneath skin; worse warm applications. Hives; worse, warmth. Violent itching; fissured eruptions. Acne. Chronic eczema associated with urinary, gastric and hepatic disorders, bleeds easily. Skin becomes thick and indurated. Varicose veins, naevi, erectile tumors. Brown spots, freckles worse on left side of face and nose. Dry, shrunken, especially palms; hair becomes prematurely gray. Dropsies. Offensive secretions; viscid and offensive perspiration, especially of feet and axilla. Psoriasis.
Natrum Muriaticum
Oily, shiny, as if greased. Earthy complexion. Fevers-blisters. Greasy, oily, especially on hairy parts. Dry eruptions, especially on margin of hairy scalp and bends of joints. Fever blisters. Urticaria; itch and burn. Crusty eruptions in bends of limbs, margin of scalp, behind ears. Warts on palms of hands. Eczema; raw, red, and inflamed; worse, eating salt, at seashore. Affects hair follicles. Alopecia. Hives, itching after exertion.
Causticum
Soreness in folds of skin, back of ears, between thighs. Warts large, jagged, bleeding easily, on tips of fingers and nose. Old burns that do not get well, and ill effects from burns. Pains of burns. Cicatrices freshen up; old injuries reopen. Skin prone to intertrigo during dentition.

Psorinum
Swelling of lip(s). Pale, delicate. Humid eruption on face. Sickly. Dirty, dingy look. Dry, lusterless, rough hair. Intolerable itching. Herpetic eruptions, especially on scalp and bends of joints with itching; worse, from warmth of bed. Enlarged glands. Sebaceous glands secrete excessively, oily skin. Indolent ulcers, slow to heal. Eczema behind ears. Crusty eruptions all over. Urticaria after every exertion. Pustules near fingernails.
Arsenicum Iodatum
Acne vulgaris, acne of postural or nodular type. Dry, scaly, itching. Marked exfoliation of skin in large scales, leaving a raw exuding surface beneath. Ichthyosis. Enlarged scrofulous glands. Venereal bubo. Debilitating night-sweats. Eczema of the beard; watery, oozing, itching; worse, washing. Emaciation. Psoriasis. Acne hard, shotty, indurated base with pustule at apex.
Calcarea Carbonica
Crusta lactea; itching, burning after washing. Unhealthy; readily ulcerating; flaccid. Small wounds do not heal readily. Glands swollen. Nettle rash; better in cold air. Warts on face and hands. Petechial eruptions. Chilblains. Boils.
Asteria Rubens
Face red. Pimples on side of nose, chin and mouth. Disposition to pimples at adolescence. Destitute of pliability and elasticity. Itching spots. Ulcers, with fetid ichor. Acne. Psoriasis and herpes zoster worse left arm and chest. Enlarged axillary glands, worse, at night and in damp weather.
Kali Bromatum
The Acnes are of postural, indurate nature. Scars left after the acne heals up. Physical constitution is of obese, younger person.