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What reason is there a lump on the striated surface of the left thumb?

Dec 28 20213 people replied
Description Of Condition:

5-6 years ago, I found a sand like particle growing in the left thumb line (inside). At that time, I couldn't see it with the naked eye... I found it when I rubbed my fingers... Later, I wanted to press it hard. After a period of time, I pressed it hard and it gradually grew larger... Until now, when I press or pinch it hard, it hurts a little, It's usually not painful or itchy... After getting bigger, I dare not press hard in the past two years... Until now, it's not painful or itchy if I don't press hard. Some people will get bigger if I press hard. What's the reason... Is it benign?

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