Sunburn on feet turning purple: what to know

Sunburn can cause heat, tenderness, swelling, blisters, and colour change, but purple or dusky skin on the feet may also reflect bruising, significant swelling, or reduced blood flow. The appearance alone cannot identify the cause. Compare both feet and notice whether the affected foot feels colder, numb, unusually painful, or difficult to move. [Sunburn](/conditions/sunburn/) may coexist with another problem, so do not assume the purple colour is simply part of healing.

Get out of the sun, remove tight shoes and jewellery, and keep the feet in a comfortable neutral position. Cool the skin with a clean damp cloth; do not apply ice directly or massage a painful, swollen area. Do not burst [Skin Blisters](/symptoms/skin-blisters/) or apply strong creams. A bland moisturiser may soothe intact dry skin, while [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) can be discussed with a clinician. Take a clear photo and note when the colour began and whether it changes with elevation.

Seek urgent medical care now if the foot is cold, numb, very painful, rapidly swelling, pale or blue, or if you cannot walk or move the toes normally. Emergency symptoms include faintness, confusion, breathing trouble, or severe weakness. Also seek prompt advice for spreading warmth, pus, fever, or worsening tenderness. A clinician may need to check circulation, infection, and the depth of the skin injury; do not delay because the colour later looks lighter.

Ask whether circulation and sensation are normal, whether a blister needs protection, and which pain or dressing options are suitable for the affected foot.