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Dear friend for me this is a small boil bothering you. As you are regularly saving and which may be the cause for the painful nodule you have developed. While shaving it is quite common for the hair roots getting exposed and infected.
Your problem will be solved if you take some relevant antibiotics, analgesic
and anti inflammatory.
After shaving, area should be thoroughly rinsed with soap or better to apply some antiseptic lotion to avoid such hair root infections.
Hoe your query is answered and is useful to you,