MRSA symptoms in children and adults are the same, although can vary based upon the initial skin infection or its severity. In general, seek medical attention when you see skin containing pus or fluid, such as an abscess, blister or boil. Also look for areas where the skin may be red and swollen, and feels hot and tender to the touch. This could be cellulitis, a common potentially serious bacterial skin infection. The rash of cellulitis may also begin with red bumps that begin to spread.