What are the causes of filiform warts under the armpits?

Generally, the occurrence of filiform warts under the armpit may be caused by frequent local friction, moist and hot skin conditions, human papillomavirus (HPV) infection, low immunity, or impaired skin barrier in the armpit area. It is recommended to seek timely medical advice, identify the cause, and undergo symptomatic treatment under a doctor's guidance. Detailed analysis is as follows:

1. Frequent local friction: The armpit skin contains many folds, and repeated friction between clothing and the skin during dressing or raising the arms can easily cause minor skin injuries, increasing the chance of viral invasion. In daily life, choose loose, breathable cotton clothing to reduce skin friction under the armpit, and avoid frequent squeezing or scratching.

2. Moist and hot skin conditions: The armpits contain abundant sweat glands, making them prone to sweating, which creates a moist and hot environment favorable for viral growth. It is important to keep the armpits dry, promptly wipe away sweat with a clean towel, avoid prolonged exposure to hot and humid environments, and reduce sweat retention.

3. Human papillomavirus infection: Low-risk HPV can invade damaged armpit skin, causing abnormal proliferation of epidermal cells and forming filiform warts. Patients may follow medical advice to use medications such as imiquimod cream, fluorouracil ointment, or recombinant human interferon α2b gel for treatment.

4. Low immunity: Long-term熬夜 (staying up late), excessive fatigue, and other factors that reduce immunity can prevent the body from effectively clearing the virus, making filiform warts more likely to develop. Patients can improve immunity through regular sleep patterns and a balanced diet. Additionally, they may follow medical advice to use medications such as transfer factor oral solution, thymopentin enteric-coated tablets, or pidotimod oral solution for immune regulation.

5. Impaired armpit skin barrier: Recurrent skin diseases such as eczema or folliculitis in the armpit area can damage the skin barrier, making it easier for viruses to invade. Patients should first treat the underlying skin condition. They may follow medical advice to use medications such as hydrocortisone butyrate cream, tacrolimus ointment, or mometasone furoate gel to repair the skin. If the filiform warts are prominent, laser surgery may be performed by a doctor to remove the wart tissue using high-energy heat.

In daily life, maintain armpit hygiene, change clothes regularly, avoid sharing personal items such as towels and razors with others to reduce the risk of viral transmission, and avoid tearing or pulling at the warts yourself to prevent skin damage and infection.