Cancer treatments have undergone significant advances in recent years, although they are not exempt from side effects, including skin toxicity. Different studies show that skin care for cancer patients can be effective in reducing sequelae such as inflammation, xerosis, skin rash, and radiodermatitis, among others. This is the reason why research is being carried out on the ingredients of cosmeceuticals for those indicated for oncological skin care. On the other hand, it is necessary to implement measures that improve the patient’s well-being and, therefore, thalassotherapy techniques and the marine environment could be an effective resource to achieve this goal. This article reviews the publications related to skin care after cancer treatment, including thalassotherapy techniques that can also contribute to well-being.