Why is a black lump on my lips?

Yes, Montelukast sodium and fexofenadine hydrochloride are two of the medications used to cure skin allergies. Skin allergy patients usually get symptoms like itching, redness, and rashes. They perform this role by impeding the action of those substances on the parasympathetic nervous system. Consult an allergist before starting these medications for your skin allergies.

A small circular bald spot on the scalp after popping a pimple is not uncommon, but if the area is sensitive and hair is falling out, please see a dermatologist to rule out infection or other underlying conditions.

Fungal infections can lead to an itchy rash in the vaginal and thigh area. The warm and humid climate is an ideal growth environment for fungi. Keep the area dry and clean. You can use antifungal creams available over the counter to help clear it up. Moreover, wearing loose and breathable clothes is also important. 

Allergic dermatitis can lead to redness, itching, and swelling in the affected area It is necessary to find out which allergen is causing the reaction and avoid it. I suggest you to see a dermatologist for proper diagnosis and treatment.
 

Finasteride is mostly safe to use for most people and it's not a direct cause of prostate cancer. Nevertheless, it can have an impact on the behavior of the prostate which in turn, may result in a PSA test result being altered. If you have concerns, it's always best to talk to your doctor. 

This can cause redness, swelling, and bleeding. The needle can carry bacteria that may cause infection. Gently clean the area with soap and water, apply an antiseptic, and use a bandage to cover it. If you notice any listed symptoms such as increased pain, spreading redness, or pus, try to get medical assistance to get rid of it.