What the immune system can not do is eliminate the virus from nerve cells, these are usually immune privileged sites and the virus can become latent there. The virus can sometimes block the production of signal molecules so that the infected cell is not identified by the immune system.
The immune system is constantly, actively working against the virus which why cold sores appear when people have other infection that the immune system is responding to.
Sunburn can temporally wipe out immune system cells in the skin, allowing the virus to break latency and spread to other cells, causing sores.
Stress and fatigue can cause immune suppression, allowing the virus to break latency and spread to other cells, causing sores.
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