Hi, Doctor After My Second Delivery Of Boy Baby .i

hi, doctor after my second delivery of boy baby .i had few tiny three moles in round shape on my left thigh very close to vagina but now this tiny black dots are more in number and extended to other thigh too. i am 38yrs and more worried after knowing that my aunt having cancer in first now she is on a one pill for five yrs after an operation. i am bit worried about the test and expenses too. please response to me with positive answer and how to examine the skin cancer.