What could cause a smooth rash on the crease of your neck?

A number of things could cause a smooth rash on the crease of your neck, including:

* Atopic dermatitis (eczema) is a chronic skin condition that causes dry, itchy, and inflamed skin. It can affect any part of the body, but it is common in the creases of the neck, elbows, and knees.

* Contact dermatitis is a skin condition that occurs when the skin comes into contact with an allergen or irritant. Common allergens include poison ivy, oak, and sumac, as well as certain metals, fragrances, and chemicals.

* Seborrheic dermatitis is a chronic skin condition that causes red, scaly patches of skin. It is common in areas of the body with high oil production, such as the face, scalp, and chest.

* Psoriasis is a chronic skin condition that causes red, scaly patches of skin. It can affect any part of the body, but it is common on the elbows, knees, scalp, and lower back.

* Tinea versicolor is a common fungal infection of the skin that causes white or brown patches of skin. It is often found on the chest, back, and arms.

If you are experiencing a smooth rash on the crease of your neck, it is important to see a doctor to get a diagnosis and treatment.