Hello, I have a red inflamed rash that is spreading,red bumps, some are irregular but some areas start as 4 red bumps in the perfect square,sometimes 3 bumps in a triangle and then some are single , some are oblong.The bumps sometimes itch but not excessively. The bumps started on my hands,forearms and now to front of upper thighs legs and trunk of my body. I have not been in yard etc for poision ivy, or changed detergents or body lotion. What could this be?