The patient will see the swelling at the fever blister site along with the development of little, hard and pimple-like protuberances that are highly painful.
In this stage, the ulcer becomes dry and will scab in the areas where the lesion is not kept moist by the saliva from the oral cavity.
In the healing stage, a number of scabs are formed on the lesion which subsequently flakes off. While still in the final stage of their life cycle the fever blister can tend to come back. Pay attention and be careful as the cold sore virus is very infectious from the first irritation the complete absence of the fever blister signs and symptoms.
The blisters eventually rupture as painful open sores, develop a yellowish membrane before healing, and disappear within 3 - 14 days. The exception -- if a blister is in an area where it might get rubbed, such as on the sole of the foot.
Fever, running nose and head pains are other common symptoms associated with this point of the stage.

The fever blisters can easily spread from one person to another or from one part of the body of the infected person to another site in the same patient. Ulcer stage which is also known as weeping stage is the most painful and contagious of all the stages. For a broken blister that has drained, protect it from infection by covering it with a bandage.
The skin may remain slightly pink or red.The symptoms like headaches, fever and edematous lymph glands start healing by now. Itching and irritation of the cold sore are still experienced even though the healing process continues. The infection can spread even at this stage so the patient should avoid any kind of physical contact. This marks the first stage of the cold sores as the virus is heading towards the outer surface layer of the neural tissue cells.
Healing continues underneath the new skin which is a constant source of tingling and redness present in the area for another week or more.

The scab may harden, start to crack and may cause painful bleeding that could prolong the time for the cold sore healing process.
A cold sore will develop a yellowish crust or scab as it begins to finally start the healing process. POST SCAB AND FINAL HEALING - At this cold sore stage your scab is gone and the new skin is visible. The cold sore heals from the inside out and needs the scab to protect and speed the healing process.

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