Basal cell carcinomaMost common malignant skin tumor Etiology:- Sun exposure- Skin types I and II (people with light complexions, red hair, and who sunburn easily)- Nevoid basal-cell carcinoma syndrome (Gorlin syndrome) ...
Seborrheic keratosisBenign growths of immature keratinocytes.- Most common benign skin tumor in the elderly population (20%) Histology:- Papillomatosis- Immature keratinocytes with small keratin-filled cysts (horn cysts).- ...
Verruca vulgarisHyperkeratosis and hyperplasia of epidermis commonly caused by human papillomavirus 1-3. Localization: elbows, knees, fingers, palmsAppearance: skin-colored or whitish, rough, scaly papules or plaques ...
Premalignant skin lesions- Lentigo maligna - Actinic keratosis - Leukoplakia - Bowen's disease and Erythroplasia of Queyrat
Actinic keratosisA UV-induced precancerous skin lesion that may progress to skin cancer. Etiology: sun exposure (e.g., from working outdoors) Clinical presentation:- Small lesion with rough surface → sandpaper-like ...
Cutaneous squamous cell carcinomaSecond most common skin cancer after basal cell carcinoma. Etiology:- Malignant transformation of keratinocytes in the stratum spinosum of the epidermis.Risk factors:- Sun exposure (especially among fair-skinned ...
MelanomaHighly malignant tumor arising from melanocytes, is the most common life-threatening dermatological disease. Risk factors:- UV radiation exposure- Light skin- Numerous nevi, giant congenital nevi, or ...
