The underlying cause for the pigmentation and itching of skin is extreme dryness. Use a good hydrating soap bar like cetaphil
while bathing and apply moisturising lotion meant for very dry skin
immediately after bath to lock in the moisture. Use a Luke warm water to bath as hot water rips of the moisture from skin. Moisturising lotions containing lactic acid or urea are good for dry skin. As your skin seems a bit sensitive too cetaphil restoraderm is a good choice as a moisturising lotion. Moisturise your skin twice in a day. If there is too much of itching or redness
on face, mild steroid
can be used for few days along with moisturisers. Once the proper skin hydration is achieved, treatment can be taken to reduce pigmentation. Take care.