I found a little lump in my left breast and I'm a guy! It only hurts a little when I press on it. What could this be? When a guy goes through puberty, all kinds of changes take place in his body.

What is gynecomastia?
Causes of gynaecomastia
You may be able to minimize puffiness by making changes to your diet and exercise routine. This can help reduce body fat and strengthen your chest. You can reduce puffiness in your pectoral area by doing chest exercises. These exercises are specifically designed to tighten and tone your pectoral and chest muscles.
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It can occur in one or both breasts. Pubertal gynecomastia happens during the early years of puberty and usually goes away within 12 to 18 months. The causes of pubertal gynecomastia are not entirely understood. However, it is thought that hormone changes in puberty lead to these physical breast changes in adolescent males. Gynecomastia can also be caused by different medications and substances. Some medicines that can be associated with gynecomastia including medicines used to treat heart problems, stomach problems, and mental health problems.