How effective is puva for dermatitis?

UVB better choice. Puva is effective for treatment of certain skin diseases such as psoriasis and vitiligo but it has been replaced with uvb light therapy mainly due to the higher risk of skin cancer with puva compared to uvb. Since narrow band uvb therapy has been shown to be just as effective if not more than puva with less risk of skin cancer and side-effects, uvb is considered a better option.