Hello,
The symptoms are suggestive of cheilitis and contact
dermatitis. Firstly,It can be due to vit B deficiency. Give some vitamin B complex
for some days and see if his symptoms improve.
Secondly, it can be due to atopic dermatitis or eczema("Atopic" refers to a group of diseases where there is often an inherited tendency to develop other allergic conditions, such as asthma and hay fever). Cheilitis(Inflammation of the skin on and around the lips)is often seen in atopic dermatitis.