'Stay out of the sun' means no tanning, no prolonged direct exposure, and no sunburns. If you walk to your car, wear sunscreen (SPF 50+). A tanned skin absorbs the laser energy, which increases the risk of burns and blisters. It also makes the laser less effective because the energy is wasted on your skin pigment instead of the hair root. Regarding hot yoga – absolute no for 48 hours. Heat and sweat can cause folliculitis (infected hair follicles) and irritation. You also shouldn't take hot showers, saunas, or use tight clothing for 24-48 hours. Treat your skin like it's a little sunburned. Cool compresses, aloe vera, loose cotton clothing.