Getting a human bite­ might seem harmless, but it re­quires care. Five te­eth bruise marks signal potential te­tanus risk. This bacterial infection causes muscle­ stiffness, trouble swallowing. Don't delay consulting your doctor if bitte­n. They'll likely recomme­nd a tetanus shot as preventive­ measure. 

It's great that you finished your vaccination following the first cat scratch. Having a new scratch 5 months later, you do not need to get the vaccine again. As long as you have finished the full course in the past and it is less than a year since then, you are safe. Be on the lookout in case of any flaming, puffing, or fever. If you see these signs, consult your doctor.

For if you are worried that your skin has melanoma, a dermatologist should be visited immediately. Melanoma is a serious type of skin cancer that needs medical practitioner attention. So a in person examination and any tests that may be required to establish if you have melanoma.

Hi Muskan... Firstly, please stop using any chemical creams or other treatments as they can prove harmful for your skin. Instead, try going for moisturizers to keep your skin hydrated and use natural ingredients like honey, turmeric etc. to lighten your skin. I also advise you to apply sunscreen when going out. Also, please follow a healthy lifestyle to keep your skin healthy and protected. I hope this answer proved helpful.