Hi, the bad bite like soars on your thighs may be a infection of the skin or hair follicle. the presence of pain usually rules out the malignant causes unless there is evidence of infection. the presence of cancer your family needs genetic counselling
and screening for the early diagnosis and treatment of cancer. if the lesions are irregular and bleeding much, you can consult the dermatologist
to rule out common skin infections and need for the biopsy
of the same.