how long do cold sores last

Cold sores typically last 1 to 2 weeks (roughly 7 to 14 days) to heal completely. First-time outbreaks or sores in people with weakened immune systems can sometimes take up to 3 weeks to clear.

Typical Healing Timeline

A cold sore progresses through five distinct stages from start to finish:

• Tingling and itching (Days 1 to 2). You feel a burning, itching, or tingling sensation around your lips before any bump appears.
• Blister formation (Days 1 to 2). Small, painful, fluid-filled blisters emerge on a red, swollen base.
• Oozing and ulceration (Days 2 to 3). The blisters burst open and weep clear or yellowish fluid, leaving a shallow red sore. This is the most contagious phase.
• Crusting and scabbing (Days 3 to 4). The sore dries out and forms a golden-brown or dark scab that may crack or bleed.
• Complete healing (Days 6 to 14). The scab shrinks and naturally flakes off without leaving a scar, revealing pink skin underneath.

Contagiousness and Care Tips

• Contagious period. You can spread the virus from the first moment you feel tingling until the scab completely falls off and the skin heals. Avoid kissing, sharing utensils or lip balm, and touching the sore during this time.
• Speeding up recovery. Applying over-the-counter creams (such as docosanol) or taking prescription antiviral pills (like acyclovir or valacyclovir) as soon as tingling starts can shorten the outbreak by a day or two.
• Avoiding delays. Do not pick or squeeze the scab, as doing so causes bleeding, introduces bacteria, and prolongs healing.

When to See a Doctor

Consult a healthcare provider at clinics like NHS inform or Cleveland Clinic if your cold sore has not started healing after 10 to 14 days, becomes unusually large or painful, or occurs alongside a weakened immune system.