> For the complete documentation index, see [llms.txt](https://docs.saas.haut.ai/haut.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.saas.haut.ai/haut.ai/haut.ai-features/algorithms/face-skin-analysis-3-0/breakouts/post-acne-hyperpigmentation.md).

# Post-acne Hyperpigmentation

What the Post-acne Hyperpigmentation parameter detects, the facial areas it covers, and how to read the grades it returns.

## About Parameter

The parameter detects and assesses post-acne hyperpigmentation, which typically appears as flat, discolored marks remaining after a breakout heals, signifying past skin inflammation. This parameter aids in monitoring skin tone uniformity and tracking the progress of pigmentation correction.

## Features

1. Evaluates severity (grade) of post acne hyperpigmentation lines
2. Multi-area analysis: nose, forehead, perioral, left cheek, right cheek.
3. Works with 1 and 3 side facial images.

## Output

1. Grade from 1 to 5.
2. Density in per mille (‰) for the whole face and specific facial regions: nose, forehead, left eye, right eye, perioral, left cheek, right cheek.
3. Vector mask for detected features.

## Grades Description

<table><thead><tr><th width="119.62109375">Grade value</th><th width="359.796875">Description</th><th>Tags</th></tr></thead><tbody><tr><td>1</td><td>The skin is free from the post acne hyperpigmentation or is less than &#x3C;1‰</td><td>Great</td></tr><tr><td>2</td><td>The skin area affected by the post acne hyperpigmentation within the range of 1-5‰</td><td>Good</td></tr><tr><td>3</td><td>The skin area affected by the post acne hyperpigmentation within the range of 5-10‰</td><td>Average</td></tr><tr><td>4</td><td>The skin area affected by the post acne hyperpigmentation within the range of 10-30‰</td><td>Poor</td></tr><tr><td>5</td><td>The skin area affected by the post acne hyperpigmentation is more than 30+‰</td><td>Poor</td></tr></tbody></table>

## Algorithm API

{% hint style="warning" %}
API access is available only for <mark style="color:purple;">**Professional**</mark> plan clients
{% endhint %}

See [Post-acne Hyperpigmentation Parameter Result Scheme](/haut.ai/developers/saas-api-overview/api-for-face-skin-analysis-3.0/breakouts/post-acne-hyperpigmentation.md)

***

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