Dermatologic conditions

Atopic dermatitis

Contact dermatitis

Hidradenitis suppurativa

Lichen planus

Lichen sclerosis

Psoriasis

Seborrheic dermatitis

Dietary irritants

Beer

Caffeine

Chili peppers

Citrus

Milk

Tomatoes

Fecal soilage

Anal fissure

Chronic constipation

Chronic diarrhea

Fistula

Incontinence

Prolapsed hemorrhoids

Rectal prolapse

Skin tags

Infections

Abscess

Candida (intertrigo)

Corynebacterium minutissimum (erythrasma)

Molluscum contagiosum

Parasites (e.g., pinworms, scabies)

Sexually transmitted diseases (e.g., herpes simplex virus, human papillomavirus, syphilis)

Staphylococcus aureus

Malignancy

Bowen disease

Extramammary Paget disease

Squamous cell carcinoma

Medications

Chemotherapy

Colchicine

Neomycin

Quinidine

Miscellaneous

Idiopathic

Lumbosacral radiculopathy

Psychological disorders

Systemic disease

Aplastic anemia

Diabetes mellitus

Inflammatory bowel disease

Jaundice

Leukemia

Lymphoma

Thyroid disease

Topical irritants

Deodorants

Detergent/fabric softener

Hemorrhoid remedies

Soaps

Suppositories

Talcum powder

Tight clothing

Toilet paper dyes and perfumes