Baby rash on trunk can occur due to various kinds of causes. The common rash found on trunk as well as any other part of body is usually benign. One of the causes of rash on baby trunk is seborrheic dermatitis. Seborrheic dermatitis also known as seborrheic eczema is a skin condition when there is inflammation of the skin especially affects areas where there are sebaceous glands which make the oil or sebum.
Seborrheic dermatitis exact cause is poorly identified. But, the Malassezia species of yeast germs may cause the condition to appear and it is not contagious although it is not a simple skin infection. The yeast germs likely live in sebum. Babies react differently towards the condition, some may not experience anything but other may have skin inflammation.
Baby rash on trunk due to seborrheic dermatitis is occasionally found on greasy areas of the skin. Other than trunk the skin condition is usually affected scalp, forehead, face including eyebrow area and on one side of the nose, armpits, groins, and inside and behind the ears.
For the mild cases of baby rash on trunk due to seborrheic dermatitis, the affected skin may develop flaky mild patches and it may be itchy but no rash found. When seborrheic dermatitis gets worse, the rash occurs. The rash is often identified as red patches in oval or round shape, scaly, greasy skin. The patches of skin is usually has various size and each patch is only few centimeters in length. In every patch there is a formation of yellow-brown crusts spotted on the top of it. The rash caused by sebborheic dermatitis can cause itchy sensation and feel slightly raised. If the rash found on the scalp, the scalp may become itchy and or sore. If the rash found on ear or eyelid, the rash may cause inflammation of the outer ear canal or eyelid.