I have a pimple under my armpit. Is it painful when I press it?

A pimple under your armpit that's painful to the touch may not be a serious condition, but it does not rule out an underlying health problem. If the pimple continues to grow or is accompanied by persistent pain, you should see a doctor as soon as possible. Possible causes include sebaceous cysts, swollen lymph nodes, or skin infections.

1. Sebaceous cyst: This is a common skin problem caused by blocked sebaceous glands and is usually harmless. It often appears as a small, hard cyst under the skin. Mild pain may be due to inflammation of the cyst or compression of surrounding tissues. If the cyst is not large and there are no obvious signs of infection, no special treatment is usually required. However, if the cyst becomes infected or enlarged, you can consider medication to relieve inflammation, such as anti-inflammatory drugs or antibiotics, and take surgical methods such as incision and drainage under the doctor's advice.

2. Swollen lymph nodes: The armpits are where lymph nodes are concentrated. Swollen lymph nodes caused by infection, inflammation or immune response are more common. Common factors that cause swollen lymph nodes include upper respiratory tract infection, skin trauma, etc. Generally, the swollen lymph nodes will shrink automatically after the underlying cause is eliminated. If the lymph nodes continue to swell and become hard and immobile, it is recommended to undergo a medical evaluation as soon as possible to rule out other potential causes.

3. Skin infection: such as folliculitis or hidradenitis, which may cause pain and accompanied by redness, swelling and even pus. Local infection is usually caused by bacterial invasion and needs to be kept clean and antibacterial ointment should be used. If the infection is severe, oral antibiotics may be required.

In most cases, there is no need to worry too much about the bumps under the skin of the armpits. Just observe them carefully and see a doctor if necessary. If the bumps are uncomfortable or other symptoms such as fever, fatigue, etc. occur, you should contact a doctor in time for professional advice. Maintain good personal hygiene and avoid squeezing or handling the bumps by yourself to avoid infection or worsening symptoms.