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As global temperatures continue to soar, extreme heat poses numerous health risks, some of which are visible on our skin. Understanding how heat affects your skin can help you take measures to prevent or ease many skin conditions that are sparked or worsened by high temperatures.

People often confuse age spots with sun spots, which can develop into skin cancer. Age spots are flat, but sun spots (known medically as actinic keratoses) often feel rough and scaly. People should seek a doctor's evaluation if they develop sun spots.

People should do a full-body skin check-up every three to six months to identify abnormalities that may be early signs of skin cancer or other skin problems. Write down the date of the self-exams, record any issues like new or questionable moles, sores, painful or itchy spots, raised or firm bumps, dark flaky patches, and unusual freckles. Include the exact locations of these skin issues and take photos for reference. After six to eight weeks, see a dermatologist if they have not improved, have changed color or size, have become painful, or easily bleed.

Merkel cell cancer is a rare form of skin cancer that often spreads aggressively to other areas of the body. Here's what to know about it, including who is more likely to get it and how you can take steps to help prevent it.

Skin lumps or bumps occur on or just under the skin. Most are harmless. Aside from basal and squamous cell skin cancers, most other skin lumps are epidermal cysts or lipomas. Other growths include cherry angiomas, dermatofibromas, keloids, and very rarely cancerous tumors called sarcomas. People should seek medical attention for any lump appearing near lymph nodes, which sometimes signals cancer. A doctor should also evaluate growths that grow quickly, bleed, look infected, or feel painful. Most skin lumps or bumps don't need treatment.

Melanoma kills about 8,000 Americans each year. Most people are at low risk of melanoma and don't need annual skin cancer screenings. People should be screened each year if they have risk factors such as dozens of atypical moles, a family history of melanoma or atypical moles, an earlier skin cancer, certain genetic mutations or predisposition, immune-suppressing therapy after organ transplantation or for inflammatory bowel disease, a history of blistering sunburns, or substantial tanning bed use.

Sun-protective clothes are made of materials that shield your skin from harmful ultraviolet (UV) rays. The most effective fabrics for the job have high thread counts, are tightly woven, and are dark or bright colors (which absorb light). Examples include polyester, nylon, lightweight wool, or canvas. Many clothing manufacturers now use high-tech fabrics for sun-protective garments. Some wick away moisture and dry quickly. Some are embedded with chemicals used in sunscreens (such as zinc oxide and titanium dioxide). High-tech fabrics offer at least as much protection as regular densely woven fabrics, and maybe more.