Institute of Human Anatomy - What's a Mole?
The discussion focuses on two main types of skin spots: lentigenes and moles. Lentigenes, commonly known as sun spots, age spots, or liver spots, are caused by UV exposure leading to an accumulation of melanin in specific areas of the epidermis. These are not harmful but are a result of sun damage. Moles, technically referred to as nevi, are benign growths formed by the overgrowth of melanocytes. Unlike malignant melanoma, these moles are non-cancerous and can appear raised due to the upward push of melanocytes into the epidermis.
Key Points:
- Lentigenes are caused by UV exposure and are commonly known as sun spots or age spots.
- These spots are an accumulation of melanin due to sun damage.
- Moles, or nevi, are benign growths from melanocyte overgrowth.
- Moles are non-cancerous and differ from malignant melanoma.
- Raised appearance of moles is due to melanocytes pushing into the epidermis.
Details:
1. 🌞 Sun-induced Freckles and Lentigenes
- Lentigenes, commonly known as sun spots, age spots, or liver spots, are caused by sun damage and are characterized by an accumulation of melanin in the epidermis.
- These spots are specifically due to UV damage, distinguishing them from other types of freckles.
- Unlike freckles, which can fade without sun exposure, lentigenes tend to persist and may darken over time with continued UV exposure.
- Prevention includes using broad-spectrum sunscreen and wearing protective clothing to minimize UV exposure.
- Treatment options for lentigenes include topical retinoids and laser therapy, which can reduce the appearance of these spots.
2. 🧬 Understanding Moles and Nevi
- Moles, medically termed as nevi, form from an overgrowth of melanocytes, which are the cells responsible for producing pigment in the skin.
- This overgrowth is benign and should not be confused with malignant melanoma, which is cancerous.
- Typically, moles appear raised due to the overgrowth pushing upward into the epidermis.
- Understanding different types of moles is crucial as they vary in color, size, and shape; common types include junctional, compound, and dermal nevi.
- Changes in moles over time, such as an increase in size, color variation, or irregular borders, should be monitored as they may indicate potential skin health issues.
- Regular monitoring and dermatological check-ups are recommended to ensure moles remain benign and do not develop into harmful conditions.