Hello. Thanks for writing to us at healthcaremagic The rashes are most likely due to irritation to cream since hair removal creams are known to cause skin irritation, if allowed to stay on for too long. However, the irritation is usually without any intervening/lay off period and starts as soon as it happens. Though it would be very hard to comment about the sore, as to what exactly it is due to without actually having being able to have a look at it. A painful sore could be a different condition altogether such as herpes, though herpes usually has multiple lesions/sores Or it could also be an aphthous ulcer. I would suggest that you visit a dermatologist in your region for a confirmatory diagnosis. Regards