Desonide lotion can be used for certain skin problems on the fingers, such as mild eczema, dermatitis, or allergic rashes, but it should only be used if prescribed by a doctor, as it is a steroid medicine. It helps reduce redness, itching, and inflammation, but using it without a proper diagnosis can actually worsen the condition. Apply a thin layer for a short duration as advised, avoid using it on broken skin unless told, and do not use it for long periods to prevent side effects like skin thinning. If the problem does not improve within a few days or spreads, it is important to consult a doctor for the correct diagnosis and treatment.