Clinic: My child's toe nails have turned black and brittle

I think your child is suffering from a problem called onychomycosis? (Images: Shutterstock)

Dear Dr Ombeva,

My son’s nails have become black and are breaking off. This happened progressively over the last two months since we moved towns. We have stayed in our new home for three months now. Some doctor told us it may be an infection, but the medication they gave us is not effective. What do you think is the problem?