Alteration Tools in Adobe cs6

Healing  
Corrects small blemishes in scanned photos. Select the tool, hold down the ALT key and left-click on the base color you need to heal.
Brush Brush
Then left-click over the blemish. Draws brush strokes of different thicknesses and colors. Select the tool. Then click on the selected area, drag to draw lines.
Blur
Use the Options bar to change the brush, mode, opacity and flow. Takes a sample of an image and applies over another image, or a part of the same image.
Clone Stamp
Select the tool. Hold down the ALT key and left-click on a certain point of the document where you want to start your copy point. Then, put your mouse over whatever part of the new document you want the picture to go to. Hold down the left mouse button and drag the mouse across the page to copy the picture.
Art History
Paints over an image using the source data from a specified history state or snapshot. Select the tool, specify the brush, blending mode, opacity, style, area and tolerance. Removes part of an existing path or stroke.
Brush 
You can use the Erase tool on paths. Text can only be erased when rasterized. Select the tool, click on the part of the image you wish to erase. Drag to erase pixels. Applies a color fill to a selected part of the image or to an entire layer.
 Eraser
Select a layer you wish to apply the paint bucket to, click the tool button, click on the starting point, and click the area you wish to fill. Blurs the sharp edges of an image.
 Paint Bucke
Select an area where you wish to apply the tool. Click the tool button and choose the brush, mode, and strength. Drag the brush along the edges.