Healthy testicles are typically a shade or two darker than the rest of your body’s skin, ranging from pinkish in lighter-skinned individuals to deep brown or nearly black in darker-skinned individuals. The scrotum (the sac surrounding the testicles) is almost always noticeably darker than nearby skin on the thighs or abdomen, and this is completely normal. The testicles themselves, inside the sac, are whitish-gray organs you wouldn’t normally see, so when most people ask about “testicle color,” they’re really asking about scrotal skin color and what’s normal versus concerning.
Why Scrotal Skin Is Darker Than the Rest of Your Body
The scrotum contains a higher concentration of melanocytes, the cells responsible for producing the pigment melanin, than most other areas of your body. In fact, the scrotum, foreskin, and the skin on the head and neck are among the most melanocyte-dense regions on the human body. Since melanin content determines skin color, this naturally makes scrotal skin darker relative to your baseline tone. This is true across all skin tones and ethnicities. A person with fair skin may notice their scrotum looks tan or brownish-pink, while someone with medium or dark skin may see a deep brown or near-black scrotum.
This darker pigmentation isn’t a sign of anything wrong. It develops during puberty as hormone levels rise and tends to stay consistent throughout adulthood, though it can deepen slightly with age.
How Temperature and Blood Flow Change the Color
The scrotum is uniquely designed to regulate temperature for sperm production, and this regulation visibly changes its appearance throughout the day. The scrotal skin has no subcutaneous fat layer, contains abundant sweat glands, and relies on two key muscles to adjust positioning: the dartos muscle in the scrotal wall and the cremaster muscle in the spermatic cord.
When you’re warm or relaxed, the dartos muscle loosens, letting the scrotum hang lower and the skin stretch thinner. Blood vessels near the surface dilate to release heat, which can give the skin a slightly redder or more flushed appearance, especially in lighter-skinned individuals. When you’re cold, the muscles contract, pulling the scrotum tight against the body and reducing blood flow to the skin surface. This makes the skin appear paler, more wrinkled, and sometimes slightly purplish as circulation to the surface decreases.
Exercise triggers a similar response. Physical activity activates the sympathetic nervous system, causing the cremaster and dartos muscles to contract. Scrotal skin temperature actually rises during a run because the sac draws closer to the warm trunk of the body. This combination of increased heat and shifting blood flow can temporarily make the scrotum look redder or more flushed than usual.
Normal Color Variation Between the Two Sides
It’s common for one side of the scrotum to look slightly different from the other. The left testicle hangs lower in most men, which means the skin on that side may stretch more and appear slightly different in tone. Minor asymmetry in color, size, and hang is normal and not a cause for concern. What you’re looking for is a sudden, dramatic change in color on one side compared to the other.
Color Changes That Signal a Problem
While the scrotum’s color shifts throughout the day are harmless, certain color changes can indicate something that needs medical attention.
Redness
A scrotum that turns persistently red, especially with sharp borders and a burning or painful sensation, may indicate a condition called red scrotum syndrome. This is a rare, chronic condition that mostly affects men in the second half of life. Unlike eczema, the hallmark symptom is burning pain rather than itching, and the redness typically affects the front half of the scrotum and can extend to the base of the penis. Sudden redness with swelling and warmth can also point to a bacterial or fungal infection, which is one of the primary conditions doctors rule out when they see scrotal redness.
Blue or Purple
A sudden blue or purple discoloration is more urgent. In testicular torsion, where the spermatic cord twists and cuts off blood supply, the affected side can turn dusky or bluish as the tissue loses oxygen. This is a medical emergency that requires treatment within hours to save the testicle.
There’s also a related but less dangerous condition called torsion of the testicular appendage, a tiny tissue remnant near the top of the testicle. When this twists, it can sometimes produce what’s known as a “blue dot sign,” a small, dark bluish spot visible through the scrotal skin at the upper pole of the testicle. This sign is considered a classic indicator of appendage torsion, though it only shows up in about 21% of cases. Pain from this condition is typically milder and more localized than full testicular torsion, and it usually resolves on its own.
Dark or Black Patches
New dark spots or patches that weren’t there before can occasionally represent benign conditions like angiokeratomas (small, harmless blood vessel growths common on the scrotum with age) or, rarely, melanoma. Because the scrotum has such a high concentration of melanocytes, any new, irregularly shaped, or growing dark spot is worth having examined.
What to Actually Watch For
The key isn’t what color your scrotum is right now. It’s whether the color changes suddenly or looks dramatically different from your normal. A scrotum that has always been dark is fine. A scrotum that turns blue on one side over the course of an hour is not. Gradual, symmetric changes with temperature and activity are the scrotal skin doing exactly what it’s designed to do. Rapid, one-sided, or painful color changes are the ones that matter.