Deborah:
Probably nothing much. It sounds like there was a pimple or bocked pore or something nondescript, and your husband scratched it out of annoyance or anxiety or absent-midedness, and made it look bigger and worse, which perpetuated the cycle. There's probably no bacteria there, and certainly no fungus.
My advice: tell him to apply bacitracin ointment twice a day, leave it alone otherwise, and wait 4 weeks. The bump will gradually fade (and I do mean gradually), but it will.
If it persists after a month, show it to someone. Bet you won't have to.
Good job to get your husband to lsiten to you!
best.
Dr. R