welcome to healthcare magic forum
thank you for your query
YOu need not to worry about skin cancer
as it not occur after few application.
but in future please do not apply any bleaching agent.
for pimple you can apply clindamycin
gel on face twice a day.
you may need to take antibiotic medicine.
it is better to consult dermatologist
for proper treatment plan
avoid scratching or popping the lesion .
i hope i answered your query