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What medical conditions cause genital lesions that resemble acne? - genital acnes picture

What could be genital lesions that are similar in appearance of acne and the development of the head as acne is not working? Might just acne, without any condition causes more serious? Are there any injuries, an STI or STD look to develop acne? How should we worry about these injuries are very rare, but sometimes painful, not itchy and small scars?