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Objectives: Knowledge of the typical features seen by dermoscopy in common nail disorders will aid the dermatologist and general physician to obtain a surer diagnosis, which will direct the appropriate and timely treatment.

Introduction: Introduction
Nail disorders represent a category of common conditions such as psoriasis, onychomycosis, paronychia, pseudomonas infections, and trauma-related changes. A proper diagnosis is essential for appropriate management; however, this is sometimes difficult to achieve whenever examination is solely clinical. Dermoscopy, or onychoscopy, has proved to be a useful tool to aid in the differentiation of these nail conditions.

Materials / method: Dermoscopy provides a comprehensive overview of the nail unit, which enables the detection of subtle changes that might be missed during a simple clinical examination.
I will be presenting clinical cases complaining of nail unit changes and showing their main dermoscopic features and their diagnostic value.

Results: Nail psoriasis typically presents with yellow discoloration or oil spot, subungual hyperkeratosis, onycholysis and splinter hemorrhages. The longitudinal striations are seen as jagged, interrupted, or spiky, associated with white or yellow-orange patches or streaks, thus confirming the diagnosis of distal lateral onychomycosis. Paronychia and pseudomonas infections of the nails present with periungual erythema, edema, and green discoloration, while traumatic changes to the nail reveal hematomas, onycholysis, transverse ridging and irregularities of the nail plate.

Conclusion: The role of dermoscopy as an auxiliary tool to clinical examination in the diagnosis of nail diseases will be demonstrated supported by images of actual cases and updated literature review.

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Objectives: learn that pigmentation of nails is not just cosmetic but can be a sign of various systemic deseases

Introduction: Longitudinal melanonychia can be aestetically disturbing. However it also can be a sign for an internal or local desease. What can be done to differentiate and to treat ?

Materials / method: literature search on the topic

Results: Diagnoses , which are most likely
1. Benign genetic Melanonychia
2. subungual hematomas,
3. nail trauma
4. Onychomycosis
5. Lichen planus of the nail
6. Addison's disease
7. Subungual melanoma

Conclusion: Melanonychia is a diagnostic challenge for clinicians and melanoma of the nail is the most concerning cause of it . However melanonychia most often occurs as a result of benign etiologies. Depending on additional symtoms a biopsy hast o be discussed.One of the key symtoms can appear as "Hutchinson's sign,"a streak which extends from the tip of the nail all the way down to the nail bed and into the cuticle. It also can be a sign of internal , genetic or immunologic diseases
Melanoychia is due to nail invasion by melanin-producing pathogens.The laser procedure helps in clinical differential dia

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