Skin and subcutaneous (L00-L99).
- Allergic contact dermatitis – skin change triggered by skin contact with certain substances.
- Eczema (here: genital eczema) – group of inflammatory skin diseases that manifest themselves in a non-infectious inflammatory reaction of the skin.
- Leukoplakia – cornification disorder of the mucous membranes as well as genitals.
- Lichen planus (LP) – T-cell-mediated autoimmune reaction against the basal epithelial keratinocytes (horn-forming cells); often accompanied by erosions (skin defect) at the introitus vaginae (vaginal entrance), as well as in the chronicized state with reticular hyperkeratosis (Wickham strip).
- Lichen Vidal (neurodermatitis circumscripta; Lichen chronicus) – areal leathery skin change associated with itching.
- Localized scleroderma (circumskripte scleroderma; morphea) – chronic disease leading to hardening of connective tissue.
- Psoriasis vulgaris (psoriasis).
- Vitiligo (white spot disease)
Infectious and parasitic diseases (A00-B99).
- Thrush (mycosis/fungal infection).
Genitourinary system (kidneys, urinary tract – reproductive organs) (N00-N99).
- Bacterial vaginitis (bacterial vaginitis).
- Balanoposthitis – inflammation in the area of the glans penis (glans) and prepuce (foreskin).
- Frenulum breve (shortening of the foreskin frenulum).
- Physiological phimosis – narrowing of the foreskin, which is physiological in infants and young children.
- Vulvo-vaginitis- inflammation of the vulva (external genitals of women) and vagina (vagina) (including thrush).
Injuries, poisonings and certain other consequences of external causes (S00-T98).
- “Non-accidental injury”/sexual abuse.
Other differential diagnoses
- Scars due to surgery, trauma or scarring pemphigoid (blistering skin disease).
- Postinflammatory hyperpigmentation (hyperpigmentation due to previous inflammation).