Actinic keratoses (AK) are pre-cancerous growths on the skin caused by prolonged exposure to ultraviolet (UV) light, usually from the sun. They can appear as crusty, scaly patches on the skin, ranging in size from 1mm to over 1cm. While AKs can eventually turn into skin cancer (specifically, squamous cell carcinoma), this transformation does not occur overnight.
The exact length of time it takes for an AK to become skin cancer is difficult to predict. Generally, it can take anywhere from months to years for an AK to progress and become skin cancer. The transformation is usually slow and gradual, and the time frame is often determined by the size, location, and aggressiveness of the AK.
However, there are certain factors that can increase the risk of a quicker transition. For example, if the AK is large, located on areas of the body that are highly exposed to UV light, or if it is particularly aggressive, it can progress more quickly. Additionally, if a person has an immune system that is weakened or impaired (such as due to HIV or chemotherapy), the risk of progression is higher.
Overall, it is difficult to predict the exact amount of time it takes for an AK to become skin cancer, as it can vary significantly from person to person. That being said, it is important that AKs are monitored closely and treated promptly, as early intervention can help reduce the risk of progression.