How are you? Are there other symptoms present? With sunburn, the skin usually turns red and feel warm, may begin to itch and become painful. In some cases, blisters may appear and within a few days, the skin will begin to scale and peel. Signs of blister infection include increased redness or pain, and thick, yellow discharge from the blisters. In particular, impetigo is a skin infection caused by bacteria and characterized by small blisters that form yellow crusts when ruptured. It is important that to wash the infected areas with soap and water to prevent spreading. Topical antiseptic ointments may also be indicated. Have this checked by your doctor for proper evaluation. Direct clinical examiantion s important. Take care and do keep us posted.