Hi thanks for writing here.Isotroin
is a drug which is commonly used in acne ,it is usually associated with these side effects such as dry chopped lips.Just apply a lip moisturiser like blistex lip balm and take sun protection.Most of these side effects will get normal after stopping drug ,but it will take 1 to 2 months since it is a fat soluble drug and its effect comes even after stopping the drug.You must talk to your doctor since isotion has got a wide range of adverse effects and it is also not used routinely in lichen planus pigmentosus
.There are other safe modaliteis for treating this disease with good results,so please consult a dermatologist
.For itching you can just take tab.cetrizine
at night and apply emollient
over body.Take care.