My son was treated for a viral rash a little over a week ago, the rash covered his chest and back. Suring the rash 3 bumps larger then all the other bumps appreared, one under his arm in this arm pit, One on his butt cheeck and one on his groin. The rash has gone away but the larger bumps are still there. The are res and have not gone down in size. Any idea what these may be? He doesnt seem to have any other symptoms. Thanks