Introduction -- History -- Examination -- Investigations and Genital Skin Biopsy -- General Management of Genital Skin Disease -- Pearly Penile Papules -- Ectopic Sebaceous Glands (Fordyce Spots) and Median Raphe Cysts -- Angiokeratoma of Fordyce -- Pigmentary Disorders and Color Variation -- Phimosis -- Balanitis and Balanoposthitis -- Intertriginous Dermatoses -- Psoriasis -- Atopic Dermatitis (Atopic Eczema) -- Irritant (Contact) Dermatitis -- Allergic Contact Dermatitis -- Lichen Simplex Chronicus, Prurigo Nodularis, Picker's Nodule -- Seborrhoeic Dermatitis and Sebo-psoriasis -- Lichen Sclerosus -- Lichen Planus -- Plasma Cell (Zoon's) Balanitis -- Candidiasis -- Tinea (Dermatophytosis) -- Herpes Simplex Virus -- Genital Warts (Condyloma Acuminata) -- Molluscum Contagiosum -- Impetigo and Superficial Pyogenic Bacterial Infections -- Fournier's Gangrene -- Molluscum Contagiosum -- Syphilis -- Scabies -- Pediculosis Pubis -- Genital Granulomatous Diseases -- Genital Edema and Lymphedema -- Male Genital Dysaesthesia -- Superficial Thrombophlebitis of the Penis (Penile Mondor's Disease) -- Fixed Drug Eruption (Reaction) -- Darier's Disease and Papular Acantholytic Dyskeratosis -- Hailey-Hailey Disease (Familial Benign Chroni Pemphigus) -- Hidradenitis Suppurativa -- Pemphigus and Pemphigoid -- Aphthous Ulcers and Behçet's Disease -- Reactive Arthritis -- Trauma and Artefactual Disease -- Benign Melanocytic Nevus -- Genital Melanotic Macules and Genital Lentiginosis -- Seborrhoeic Keratoses -- Vitiligo and Acquired Depigmentation -- Scrotal Epidermal (Epidermoid) Cysts and Idiopathic Scrotal Calcinosis -- Penile Intraepithelial Neoplasia (Erythroplasia of Queyrat, Bowen's Disease -- Bowenoid Papulosis -- Pseudoepitheliomatous, Keratotic, and Micaceous Balanitis and Penile Cutaneous Horn -- Cancer of the Penis -- Buschke-Löwenstein Tumour (Giant Condyloma Acuminatum) and Verrucous Carcinoma -- Melanoma -- Extramammary Paget's Disease.