Final answer:
Cucumber and lemon juice masks can hydrate, soothe, and brighten the skin but must be used with caution due to potential skin irritation and increased photosensitivity caused by lemon juice. Always patch test and use sun protection.
Step-by-step explanation:
The effect of cucumber and lemon juice biological masks on the skin can be quite beneficial, due to their natural properties. Cucumbers contain antioxidants and flavonoids that can help reduce irritation, while the hydration they provide can soothe puffy and inflamed skin. Lemon juice, on the other hand, is rich in vitamin C and citric acid, which can brighten the skin, reduce pigmentation, and contribute to overall skin health when applied topically. However, it's important to use these ingredients with caution as lemon juice can be irritating to some skin types, especially when exposed to the sun. This is due to the presence of photo-sensitizing agents that can increase the risk of sunburn. Patch testing a small amount of lemon juice on the skin before full application is always recommended.