Irritant Contact Dermatitis: This is the most common cause of scrotal dermatitis, often resulting from exposure to soaps, detergents, or other irritants that come into contact with the scrotal skin. The scrotum's thin skin makes it particularly susceptible to irritation.

Allergic Contact Dermatitis: Similar to irritant contact dermatitis but involves an allergic reaction to substances like latex, certain metals, or components of personal care products.
Seborrheic Dermatitis: A condition that can affect various parts of the body, including the scrotum, characterized by a red, itchy rash.
Eczema (Atopic Dermatitis): Can manifest in the scrotal area, especially in individuals with a history of atopic diseases like asthma or allergies.
Tinea Cruris (Jock Itch): A fungal infection that thrives in warm, moist areas of the body, including the groin and scrotum, causing a red, itchy rash.

Scabies: A parasitic infection caused by the mite Sarcoptes scabiei, which can lead to severe itching and a rash. It's contagious and requires prompt treatment.
Lichen Sclerosus: A rare condition that creates patchy, white skin that's thinner than normal. It can cause significant discomfort and increases the risk of skin cancer if left untreated.
Squamous Cell Carcinoma: Although rare, skin cancers can present as dermatitis. Early detection is crucial for effective treatment.

Psoriasis: While more commonly associated with other body areas, psoriasis can occasionally affect the scrotum, presenting as red, scaly patches.
Darier's Disease: A rare genetic disorder that affects the skin, sometimes causing lesions in the groin area.
Hailey-Hailey Disease (Familial Benign Chronic Pemphigus): A rare inherited skin condition that can cause blisters and erosions in skin folds, including the groin area.