Many people notice their scars appear darker, redder, or more visible during the summer months. Heat, UV exposure, sweating, and inflammation can all affect how scars look and heal. Dermatologists frequently warn that healing scars are especially vulnerable to discoloration during periods of increased sun exposure (Bulan, n.d.).

UV Exposure Can Darken Scars

One of the biggest reasons scars appear more noticeable in summer is ultraviolet radiation. Healing scars are more sensitive to UV damage because scar tissue lacks some of the protective properties of healthy skin.

When scars are exposed to sunlight, melanocytes may produce excess pigment, leading to hyperpigmentation and darkening of the scar (Mayo Clinic Store, 2025).

This is especially common with:

• Surgical scars

• Acne scars

• Burn scars

• Fresh injuries

• Post-inflammatory marks

In some cases, discoloration caused by UV exposure can last for months.

Heat and Inflammation Increase Redness

Warm temperatures and increased blood flow during summer can temporarily make scars appear redder or more inflamed. Sweating and friction from swimsuits, athletic clothing, or outdoor activities may also irritate healing skin.

Even scars that were previously fading may appear more noticeable during:

• Beach days

• Outdoor workouts

• Long sun exposure

• Humid weather

This increased redness is often temporary but can worsen if scars are repeatedly irritated.

Sunscreen Is Essential for Scar Protection

Dermatologists consistently recommend daily sunscreen use to help protect scars from worsening discoloration.

Rejûvaskin Mineral Facial Sunscreen SPF 32 contains 20% zinc oxide and 4% niacinamide to help protect sensitive skin from UV exposure while supporting the skin barrier.

Mineral sunscreens are often preferred for healing or sensitive skin because they provide broad-spectrum protection while remaining gentle and non-irritating.

According to dermatology experts, protecting scars from UV exposure during the first year of healing is especially important for minimizing long-term discoloration (Bulan, n.d.).

Scar Tissue Heals Differently Than Healthy Skin

Scar tissue does not function exactly like normal skin. It may have:

• Reduced elasticity

• Altered collagen structure

• Increased sensitivity

• Different pigmentation responses

Because of these differences, scars can react more dramatically to environmental stressors like heat and sunlight.

Research shows scar remodeling can continue for many months after an injury or procedure, meaning scars remain vulnerable long after the skin initially closes (Wang et al., 2020).

Consistent Scar Care Makes a Difference

Dermatologists emphasize that consistency matters more than aggressive treatment. Protecting scars daily with sunscreen, limiting excessive sun exposure, and maintaining hydration can help support healthier scar maturation.

Helpful summer scar habits include:

• Applying SPF daily

• Wearing protective clothing

• Avoiding peak UV hours

• Keeping scars moisturized

• Reducing friction and irritation

Small daily habits often make the biggest difference over time.

Scars often appear more noticeable during summer because UV exposure, heat, and inflammation can temporarily or permanently affect scar pigmentation and texture (Mayo Clinic Store, 2025).

Protecting scars from sunlight with daily sunscreen and maintaining a consistent scar care routine can help minimize discoloration and support healthier long-term healing.

Works Cited 

Bulan, E. (n.d.). Why sun protection is important for scar healing. https://www.drerwinbulan.com/our-practice/blog/why-sun-protection-is-important-for-scar-healing/

Mayo Clinic Store. (2025). Silicone and sunscreen: Their role in scar treatment. https://store.mayoclinic.com/education/the-role-of-silicone-and-sunscreen-in-scar-treatment/

Wang, F., et al. (2020). Efficacy of topical silicone gel in scar management: A systematic review and meta-analysis. National Institutes of Health. https://pmc.ncbi.nlm.nih.gov/articles/PMC7949016/