Deep Optical Imaging of Tissue (DOIT)

Inclusion Criteria: * Healthy individuals without systemic or skin-related conditions. * Ability to provide informed consent. Exclusion Criteria: * Pregnancy: Although the risk that laser illumination on the skin may affect the fetus is minimal, we will exclude pregnant research subjects for safety. * Skin diseases: Certain skin conditions can increase the risk of damage or complications when exposed to laser light, such as active rosacea, eczema, skin infections, or tattoos. * Medication: Some medications can increase the sensitivity of the skin to laser light or increase the risk of side effects. It is important to consider the person's medical history and any ongoing treatments. * Sunburn: Recent sun exposure of the skin may lead to increased sensitivity to laser light and can be more likely to experience discomfort or skin irritation/damage. This can both affect the reliability of the study and increase the risk of injury to the research subjects. * History of keloid formation or scarring: People who have a history of excessive scarring may be more likely to react with greater skin irritation from the laser light. * For breast measurements only: History of breast cancer or surgery. In this project, we aim to map the UOT signal only in healthy breast tissue.