My son suffers from eczema but recently his skin pigmentation is changing. skin darkening and inflammation on his face. what can be the cause? what should we do to help him?

Change of color: Inflammation can cause either change in skin color: decreased, or hypopigmentation, and increased, or hyperpigmentation. The texture of the skin can also change, with rubbing or scratching. If this is not the usual color change you see, it is best to have it looked at. Meanwhile, using sunscreen for children on the area can protect the skin but wont likely change color.