There's a hard lump on the side of the body.

A hard lump on the side of the body may be caused by keloids, folliculitis, seborrheic keratosis, or other conditions, and treatment should be based on the specific cause. Details are as follows:

1. Keloid

Keloids are typically abnormal scar tissues formed due to excessive growth after skin injury heals. They usually appear as raised red hard lumps on the skin surface. Treatment may include medications such as halometasone cream or asiaticoside ointment, used under a doctor's guidance.

2. Folliculitis

Folliculitis refers to inflammation in the hair follicle area, which can lead to follicular blockage, local redness and swelling, and the formation of a hard lump. Treatment may involve topical medications such as compound polymyxin B ointment or mupirocin ointment, as directed by a physician.

3. Seborrheic Keratosis

This condition is usually caused by proliferation of epidermal keratinocytes, resulting in benign epidermal hyperplasia. It commonly occurs in older adults and may present with brownish patches. Treatment options include butyric acid hydrocortisone cream or triamcinolone acetonide/econazole cream, used under medical supervision.

In addition to the above causes, hard lumps may also result from sebaceous cysts, lipomas, fibromas, or other conditions. It is recommended to wear loose, comfortable clothing, preferably made of cotton.