You have to Exfoliate Your Underarms Regularly

Exfoliation is a scrubbing process which clears off the dead skin cells from the surface.

If you exfoliate regularly, it might catch bacterial and fungal infections.

Underarms should be hygiene all the time, which is challenging to keep it fresh all time. The underarm area deserves regular exfoliation as much as your face does.

Exfoliation by scrubbing is an ideal way to smooth and soften the underarm skin because the process exposes hair follicles, leading to a closer, smoother shave It also unclogs pores and reduces the formation of acne.

Try and wash the underarms whenever possible in a day. It keeps you fresh and keeps away from fungal disorders.

To clear the dead skin from the underarm, use a gentle exfoliating cleanser applied with a loofah, washcloth or your hand. If you want to exfoliate without taking a shower first, you can also try disposable exfoliating wipes. 

You Can Find Wipes in Any Drug Store:-

Exfoliation removes layers of skin, it's important to let the skin rejuvenate between treatments. To avoid skin irritation and damage, dermatologists recommend exfoliating the underarms no more than twice a week.

Always use an anti fungal powder whenever you feel discomfort at the underarm area. You should observe scratching feeling or any other different odor. If you notice such observations, immediately start off an anti fungal powder.

Shaving:-

While shaving sensitive areas be careful as shaving can be rough on sensitive under arms.

Ensure that you use shaving kits which are free of anti moist and irritating.

Never go for special shaving gel or cream for your underarms, but avoid using soaps that contain deodorants, fragrances, alcohol or other ingredients that can dry out and irritate sensitive skin. Whether you use regular body soap or a special shaving gel, choose mild products that contain moisturizers.

It sounds natural but you should make sure that you use a new, sharp razor when you shave. 

You should use your own razor when you do so; shared razors spread bacteria. Don't push down too hard, either, because the blade can push bacteria into your hair follicles and cause infection 

Avoid shaving frequently. Go for creams or waxing. One of the best ways to be sensitive to your underarm skin is to shave less often. 

If you allow more time for the hair underneath your arms to grow, the skin there will retain more natural moisture and be less prone to irritation. That said, allowing your armpit hair to grow may be a luxury you can't afford during beach season. And take care of the underarm skin post you shave if at all you frequently shave it. Ofcourse waxing is the best method for underarm care.