Hello,
I don’t think that they are herpes sores.Herpes sores do not appear all of a sudden.To me it sounds like folliculitis or rash due to friction rub with clothes.Folliculitis starts when hair follicles are damaged by friction from clothing or blockage of the follicle. In most cases of folliculitis, the damaged follicles are then infected with the bacteria Staphylococcus (staph).
Pls keep the area clean and apply some topical antiseptics. Also wear loose-fitting cotton clothing and use an antibacterial soap or mild soap like dove.Avoid any kind of cosmetics. Topical antibiotics such as mupirocin or neomycin containing ointment are also useful.In case the symptoms persist then oral antibiotics may be needed.Pls consult a dermatologist in that case.
Hope it helps.Take care and pls do keep us posted on how you are doing or if you have any additional queries.Kind regards.
folliculitis is the likely condition,the blood tests are highly sensitive and unlikely to show false reports.