Severe itching can be caused by several skin conditions, such as eczema, fungal infections, scabies, or an allergic reaction. Megaheal Gel (Colloidal silver) is not usually effective if the underlying cause is not treated. You should avoid scratching, keep the skin clean and dry, and consider a gentle moisturiser or an over-the-counter oral antihistamine if appropriate. Please consult a doctor or dermatologist for a proper examination to identify the exact cause and treat it appropriately.