Red streaks resembling scratch marks appear in the armpit.

Red streaks resembling scratch marks in the armpit may be caused by stretch marks, skin allergies, pityriasis versicolor, or other reasons, and symptomatic treatment is required. Specific analyses are as follows:

1. Stretch Marks

Red streaks resembling scratch marks in the armpit may be stretch marks, also known as growth lines. These are usually caused by rapid weight gain or obesity recently. Currently, there is no highly effective treatment available. Over time, these marks will gradually fade and typically do not require special treatment.

2. Skin Allergy

If irritating products such as harsh body washes have been used on the armpit area, allergic dermatitis may develop, causing red streaks that look like scratches, accompanied by symptoms such as itching and swelling. Under a doctor's guidance, medications such as hydrocortisone butyrate cream or compound betamethasone and camphor cream can be applied. Daily care should include keeping the skin clean and dry to prevent bacterial growth and infection spread.

3. Pityriasis Versicolor

If the red streaks resembling scratches are due to pityriasis versicolor, medical treatment under a doctor’s supervision is necessary, including antifungal medications such as itraconazole capsules or ketoconazole cream.

In addition to the above causes, lymphangitis could also be a possible reason. If symptoms persist or worsen, prompt medical consultation is recommended to obtain an accurate diagnosis and appropriate treatment advice.